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Q111. DRAG DROP - (Topic 1)
You are developing an application that will populate an extensive XML tree from a Microsoft SQL Server 2008 R2 database table named Contacts.
You are creating the XML tree. The solution must meet the following requirements: . Minimize memory requirements. . Maximize data processing speed. You open the database connection. You need to create the XML tree.
How should you complete the relevant code? (To answer, drag the appropriate code
segments to the correct locations in the answer area. Each code segment may be used once, more than once, or not at all. You may need to drag the split bar between panes or scroll to view content.)
Answer:
Q112. - (Topic 1)
You are developing an application by using C#. You provide a public key to the development team during development.
You need to specify that the assembly is not fully signed when it is built.
Which two assembly attributes should you include in the source code? (Each correct answer presents part of the solution. Choose two.)
A. AssemblyKeyNameAttribute
B. ObfuscateAssemblyAttribute
C. AssemblyDelaySignAttribute
D. AssemblyKeyFileAttribute
Answer: C,D
Explanation:
http://msdn.microsoft.com/en-us/library/t07a3dye(v=vs.110).aspx
Q113. - (Topic 2)
You need to write a method that retrieves data from a Microsoft Access 2013 database.
The method must meet the following requirements:
Be read-only.
Be able to use the data before the entire data set is retrieved.
Minimize the amount of system overhead and the amount of memory usage.
Which type of object should you use in the method?
A. SqlDataAdapter
B. DataContext
C. DbDataAdapter
D. OleDbDataReader
Answer: D
Explanation: OleDbDataReader Class
Provides a way of reading a forward-only stream of data rows from a data source.
Example:
OleDbConnection cn = new OleDbConnection();
OleDbCommand cmd = new OleDbCommand();
DataTable schemaTable;
OleDbDataReader myReader;
//Open a connection to the SQL Server Northwind database.
cn.ConnectionString = "Provider=SQLOLEDB;Data Source=server;User ID=login;
Password=password;Initial Catalog=Northwind";
Q114. - (Topic 2)
An application is throwing unhandled NullReferenceException and FormatException errors. The stack trace shows that the exceptions occur in the GetWebResult() method.
The application includes the following code to parse XML data retrieved from a web service. (Line numbers are included for reference only.)
You need to handle the exceptions without interfering with the existing error-handling infrastructure.
Which two actions should you perform? (Each correct answer presents part of the solution. Choose two.)
A. Option A
B. Option B
C. Option C
D. Option D
Answer: A,C
Explanation: A: The TryParse method is like the Parse method, except the TryParse method does not throw an exception if the conversion fails. It eliminates the need to use exception handling to test for a FormatException in the event that s is invalid and cannot be successfully parsed.
C: UnhandledException event handler If the UnhandledException event is handled in the default application domain, it is raised there for any unhandled exception in any thread, no matter what application domain the thread started in. If the thread started in an application domain that has an event handler for UnhandledException, the event is raised in that application domain.
Q115. - (Topic 1)
You are developing an application that will transmit large amounts of data between a client computer and a server. You need to ensure the validity of the data by using a cryptographic hashing algorithm. Which algorithm should you use?
A. DES
B. HMACSHA512
C. RNGCryptoServiceProvider
D. ECDsa
Answer: B
Q116. - (Topic 1)
You are developing code for a class named Account. The Account class includes the following method:
You need to ensure that overflow exceptions are thrown when there is an error. Which type of block should you use?
A. checked
B. try
C. using
D. unchecked
Answer: A
Q117. - (Topic 2)
You have the following code. (Line numbers are included for reference only).
You need to complete the WriteTextAsync method. The solution must ensure that the code is not blocked while the file is being written.
Which code should you insert at line 12?
A. Option A
B. Option B
C. Option C
D. Option D
Answer: D
Explanation: await sourceStream.WriteAsync(encodedText, 0, encodedText.Length);
The following example has the statement await sourceStream.WriteAsync(encodedText, 0,
encodedText.Length);, which is a contraction of the following two statements:
Task theTask = sourceStream.WriteAsync(encodedText, 0, encodedText.Length);
await theTask;
Example: The following example writes text to a file. At each await statement, the method immediately exits. When the file I/O is complete, the method resumes at the statement that follows the await statement. Note that the async modifier is in the definition of methods that use the await statement.
public async void ProcessWrite()
{
string filePath = @"temp2.txt";
string text = "Hello World\r\n";
await WriteTextAsync(filePath, text);
}
private async Task WriteTextAsync(string filePath, string text)
{
byte[] encodedText = Encoding.Unicode.GetBytes(text);
using (FileStream sourceStream = new FileStream(filePath,
FileMode.Append, FileAccess.Write, FileShare.None,
bufferSize: 4096, useAsync: true))
{
await sourceStream.WriteAsync(encodedText, 0, encodedText.Length);
};
}
Reference: Using Async for File Access (C# and Visual Basic)
https://msdn.microsoft.com/en-us/library/jj155757.aspx
Q118. - (Topic 2)
You are developing an application that will use multiple asynchronous tasks to optimize performance.
You create three tasks by using the following code segment. (Line numbers are included for reference only.)
You need to ensure that the ProcessTasks() method waits until all three tasks complete before continuing.
Which code segment should you insert at line 09?
A. Task.WaitFor(3);
B. tasks.Yield();
C. tasks.WaitForCompletion();
D. Task.WaitAll(tasks);
Answer: D
Q119. - (Topic 2)
You are implementing a method named GetValidEmailAddresses. The GetValidEmailAddresses() method processes a list of string values that represent email addresses.
The GetValidEmailAddresses() method must return only email addresses that are in a valid format.
You need to implement the GetValidEmailAddresses() method.
Which two code segments can you use to achieve this goal? (Each correct answer presents a complete solution. Choose two.)
A. Option A
B. Option B
C. Option C
D. Option D
Answer: B,D
Explanation: Note:
* List<T>.Add Method
Adds an object to the end of the List<T>.
Q120. - (Topic 2)
You are developing a class named EmployeeRoster. The following code implements the EmployeeRoster class. (Line numbers are included for reference only.)
You create the following unit test method to test the EmployeeRoster class implementation:
You need to ensure that the unit test will pass. What should you do?
A. Option A
B. Option B
C. Option C
D. Option D
Answer: B